2701 ROCKEFELLER AVE NIMBUS Geotech Report 2023-12-29

Opportunity Zone Oevelopnrent LLC JN 19152 June 6, 2019 Page 2 SUBSURFACE The subsurface conditions were explored by drilling four test borings at the approximate locations shown on the Site Exploration Plan, Plate 2. Our exploration program was based on the proposed construction, anticipated subsurface conditions and those encountered during exploration, and the scope of work outlined in our proposal. The test borings were called on May 16, 2019 using a truck -mounted, hollow -stem auger drill. Samples were taken at approximate 2.5- and 5-foot Intervals with a standard penetration sampler. This split -spoon sampler, which has a 2-inch outside diameter, is driven Into the soil with a 140- pound hammer falling 30 Inches. The number of blows required to advance the sampler a given distance is an Indication of the soil density or consistency. A geotechnical engineer from our staff observed the drilling process, logged the test borings, and obtained representative samples of the soil encountered. The Test Boring Logs are attached as Plates 3 through 6. Soil Conditfons The four test borings conducted on the site encountered relatively Consistent subsurface conditions across the property. Loose to medium -dense, native, slightly silty sand with gravel was encountered directly beneath the asphalt parking lot and crushed rock subgrade. In the northwest comer of the site, 2 feet of gravelly silty sand fill was revealed beneath the ground surface; an old concrete slab was encountered at a depth of 2 teat and the native, loose, slightly silty sand was encountered beneath this slab. The native silty sand then became dense to very dense below depths of 2.5 to 5 feet. The dense to very dense silty sand was deposited and compressed by glaciers thousands of years ago and Is referred to geologically as glacial till. Glacial oulwash soil, Consisting of very dense, poorly -graded, medium -grained, send, was encountered below the glacial till at depths of approximately 15 feet and 26 feet on the eastern and western ends of the site respectively. The glacial oulwash sand extended to the maximum -explored depths of 27.4 to 41.4 feet in all four of our test borings. As discussed above, concrete debits was encountered in the northwest comer of the site. Debts, buried utilities, and old foundation and slab elements are commonly encountered on all that have had previous development. In addition, it should be noted that cobbles or boulders are also often found In the native Solis that have been deposited by glaciers or last -moving water. Groundwater Condttiorrs No groundwater seepage was observed In our recent subsurface explorations. However, the test borings were left open for only a short time period. It should be noted that groundwater levels vary seasonally with rainfall and other factors. The stratification lines on the logs represent the approximate boundaries between soil types at the exploration locations. The actual transition between soll types may be gradual, and subsurface Conditions can vary between exploration locations. The logs provide specific subsurface information only at the locations tested. If a transition in soil type occurred between samples in the borings, the depth of the transition was interpreted. The relative densities and moisture descriptions indicated on the test boring logs are Interpretive descriptions based on the conditions observed during drilling. aEOTECH CONBOLTNJrs, INC.